Hooker's Super Competition headers feature tuned length primary tubes, mandrel bent light weight 18 gauge tubing, and a long transition collector for maximum scavenging and decreased back pressure. The flanges are machined from 5/16" thick steel for a smooth sealing surface and they are an ideal thickness to still maintain header integrity. These headers make the maximum horsepower and place it at just the right point in the power curve. All headers come with the necessary hardware for a complete and easy installation.